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stairs used in emergencies
Please use the emergency stairs in case of a fire.
state of emergency (unusually difficult or dangerous situation)
Due to the earthquake, the city declared a state of emergency.
earth science
Earth science is an important field of study for unraveling the mysteries of nature.
an Earthling; a Terran
I am an Earthling.
extraterrestrial area
We are searching for extraterrestrial life.
terraforming (planetary engineering)
The process of terraforming is part of transforming other planets into a habitable environment for humans.
historic, historical / already-happened, past / former, old, traditional
This is a historic building.
oral history
He recognizes the importance of oral history.
historicism
He interprets world events from a historicism perspective.
historian
He is a famous historian and has written many history books.
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